Improvement in millstones



UNI-TED STATES PATENT OFFICE.

DANIEL DRAWBAUGH, OF EBERLYS MILLS, PENNSYLVANIA.

IMPROVEMENT IN MILLSTONES.

Specification forming part of Letters Patent No. 38,296, dated April 28, 1863.

To all whom it may concern,.-

Beit known that I, DANIEL DRAWBAUGH, of Eberlys Mills, in the county of Cumberland and State of Pennsylvania, have invented certain new and useful Improvements in the Manner of Hanging, Balancing, and Driving Millstones 5 and I do hereby declare the following.

to be a full, clear, and exact description of the same, reference being had to the accompanying drawings, making a part of this specification, in which- Figure l represents a top plan of a portion of the bed-stone with the spindle and drivingarms, also a portion of the runner with the balance and driving ry-nd shown in red lines. Fig. 2 represents avertical section through the runner and bed-stone, and showing the mode of connecting the driving-arms with the balance-rynd.

It is most common to use but two drivingarms on the spindle, though I am aware that four have been used for the purpose of preventing the ruimer from having an irregular motion. I use four drivin g-arms for that purpose also; but, as heretofore arranged, the object was not fully attained, because the least wear of one arm prevented it from exerting the same force as the others, and, consequently, there was not uniformity in the motion of the runner, and they would wear unevenly. It is necessary for a perfectly-true motion that each drivin g-arm should exert the same force on its portion of the runner, and to arrive at this I do not actually connect the arms and balance or Vdrivin g rynds, but simply overlap or interlock them, so that by set-screws each arm may be made to bear against the rynd, and thus practically giveV them uniform driving force or effect.

To enable others skilled in the art to make and use my invention, I will proceed to de- D D, four in number, are arranged. These arms D, at their outer ends, are formed, as shown in Fig. 1, so as to lap over or interlock with recesses a, made in the balance or driving rynds E, so that set-screws b maypass through the ends of the arms D and bear against the rynds E, as shown in said Fig. l. By this arrangement the runner I is driven at four points diametrically opposite each other, and with the same uniform force at each point, and so dividing the force around the stone as to prevent it from tipping in the least injurious degree, and if at any time there should be any irregularity it may be corrected by moving the set-screws so that all shall touch their respective points of impact at the same time.

'Io apply this principle of driving to millstones not originally prepared for it, I make an opening in the crown of the two rynds, or

vat their crossing-point, in which a pin, F, is

placed, having a head or shoulder upon it, by which pin the runner is supported on the point of the spindle G. As the stone wears away the pin may be changed for another with a different-sized head, so as to keep this bearing point uniformly at or near the center of the stone, in which position it works the best. The rynds arerecessed into the runner in the usual way, as shown at H.

What I claim isl. In combination with the driving-arms and the rynds, the set-screws for making uniform and equal contact between them, and thus regulate the driving -force at all four points of contact, substantially as and for the purpose described.

2. Supporting the runner on the top of the spindle by means of a removable or adjustable pin or plug for the purpose of preserving this point of suspension as near the center of the stone as it wears away as possible, substantially as described.

DANL.v DRAWBAUGH.

Witnesses:

A. B. STOUGHTON, B. F. LEE. 

